ACiancio Posted June 7, 2010 Report Share Posted June 7, 2010 I have a new problem with my 850. I know the shocks/struts are toast and I plan to do that a little later this summer but just in the last couple of week when I brake gently (like in a parking lot or slow neighborhood the whole car vibrates like crazy. if feels like its from all 4 wheels. any ideas as to what might cause this and how to fix it? Link to comment Share on other sites More sharing options...
TM850R Posted June 7, 2010 Report Share Posted June 7, 2010 Install rear brake shims. That will fix the problem. There are quite a few threads about this issue that are active right now. http://www.fcpgroton.com/product-exec/product_id/24939/nm/1994_1997_Volvo_850_Turbo_Brake_Pad_Shim_Kit_stainless_steel_/category_id/45 Cheap and easy to do. Link to comment Share on other sites More sharing options...
7 VII 7 Posted June 7, 2010 Report Share Posted June 7, 2010 You might have to double up on the shims. Do one on each pad then if that does not fix go double. Link to comment Share on other sites More sharing options...
AverageVolvo Posted June 7, 2010 Report Share Posted June 7, 2010 You might have to double up on the shims. Do one on each pad then if that does not fix go double. There should be a teflon shim adhered to the back of the pad if oem. If not it sits behind it. Then there are the stainless shims. 1 on each side of the pad. If you still have vibrations you may need rotors. Does it also vibrate in the steering wheel or pedals? Could also be bad inner/outer tie rods. Link to comment Share on other sites More sharing options...
TM850R Posted June 7, 2010 Report Share Posted June 7, 2010 There should be a teflon shim adhered to the back of the pad if oem. If not it sits behind it. Then there are the stainless shims. 1 on each side of the pad. If you still have vibrations you may need rotors. Does it also vibrate in the steering wheel or pedals? Could also be bad inner/outer tie rods. Aftermarket pads do not have those shims. I had the exact same issue that he was having and the shims fixed it. After you install the shims you may want to take a peek at the rear shock mounts as well. If you are going to replace the shocks later in the summer you WILL need to buy a new pair of mounts. They are rather cheap and if you are in there already replacing the shocks then its just something you wont have to worry about down the road. Link to comment Share on other sites More sharing options...
7 VII 7 Posted June 8, 2010 Report Share Posted June 8, 2010 Aftermarket pads do not have those shims. I had the exact same issue that he was having and the shims fixed it. After you install the shims you may want to take a peek at the rear shock mounts as well. If you are going to replace the shocks later in the summer you WILL need to buy a new pair of mounts. They are rather cheap and if you are in there already replacing the shocks then its just something you wont have to worry about down the road. My aftermarket pads did have those shims (teflon ones). Akebono and generic AutoZone pads. I am getting the same vibration and I changed took out the teflon ones and put the half OEM ones in... vibration is sometimes there but squeaks to high hell. New shims (teflon, SS and half OEM) are on their way and I am doing Pad, teflon, half OEM piston with ATE silicone lube... so that should do the trick. Link to comment Share on other sites More sharing options...
ACiancio Posted June 8, 2010 Author Report Share Posted June 8, 2010 the pads have about 6-8k miles on them and the problem just showed up a week or so ago, could that still be the shims? I think the shims where there when I did the breaks and rotors. and no I don't feel it in the steering wheel or pedals. Link to comment Share on other sites More sharing options...
Gilhuly Posted June 8, 2010 Report Share Posted June 8, 2010 A lot of this going around. See the embedded posts in this post under my posts. Rear brake issue Link to comment Share on other sites More sharing options...
7 VII 7 Posted June 8, 2010 Report Share Posted June 8, 2010 A lot of this going around. See the embedded posts in this post under my posts. Rear brake issue I am confused. Half shims on... OK but which way should the arrows point? Up or Down? Matthewes Volvo Site says down Winky says pointing UP! I still have the vibration and squeal and I have mine pointing down. Link to comment Share on other sites More sharing options...
ACiancio Posted June 9, 2010 Author Report Share Posted June 9, 2010 so what should i order steal or teflon? Link to comment Share on other sites More sharing options...
7 VII 7 Posted June 9, 2010 Report Share Posted June 9, 2010 so what should i order steal or teflon? Get the half oem ones... I think they are steel. Anyone have input on the arrows pointing up or down? Link to comment Share on other sites More sharing options...
Dave 54 Posted June 9, 2010 Report Share Posted June 9, 2010 Anyone have input on the arrows pointing up or down? I have mine pointing down. Link to comment Share on other sites More sharing options...
7 VII 7 Posted June 9, 2010 Report Share Posted June 9, 2010 I have mine pointing down. Hell.. I might switch them up to see if that helps. My Chilton manual has a picture having them point up Link to comment Share on other sites More sharing options...
Gilhuly Posted June 9, 2010 Report Share Posted June 9, 2010 I don't know about arrows. Think about the normal rotation of the rotor on, say the drivers side. The caliper is mounted on the back. make a mark on the rotor with a sharpie. Looking at the outboard pad, the mark passes through the caliper at the bottom (leading edge) first and reappears after passing through the back (trailing edge). The cut shim material fills/loads the trailing edge, or the top of a rear mounted caliper. If you understand or accept what's happening this will make sense. This vibration is a rapid, leading edge "bite and release" like too much front brakes on your bike 20x/second. Link to comment Share on other sites More sharing options...
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